94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
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/*
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* arch/sh/kernel/stacktrace.c
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*
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* Stack trace management functions
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*
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* Copyright (C) 2006 - 2008 Paul Mundt
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/sched.h>
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#include <linux/sched/debug.h>
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#include <linux/stacktrace.h>
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#include <linux/thread_info.h>
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#include <linux/module.h>
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#include <asm/unwinder.h>
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#include <asm/ptrace.h>
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#include <asm/stacktrace.h>
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static int save_stack_stack(void *data, char *name)
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{
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return 0;
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}
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/*
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* Save stack-backtrace addresses into a stack_trace buffer.
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*/
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static void save_stack_address(void *data, unsigned long addr, int reliable)
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{
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struct stack_trace *trace = data;
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if (!reliable)
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return;
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if (trace->skip > 0) {
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trace->skip--;
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return;
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}
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if (trace->nr_entries < trace->max_entries)
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trace->entries[trace->nr_entries++] = addr;
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}
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static const struct stacktrace_ops save_stack_ops = {
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.stack = save_stack_stack,
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.address = save_stack_address,
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};
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void save_stack_trace(struct stack_trace *trace)
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{
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unsigned long *sp = (unsigned long *)current_stack_pointer;
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unwind_stack(current, NULL, sp, &save_stack_ops, trace);
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if (trace->nr_entries < trace->max_entries)
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trace->entries[trace->nr_entries++] = ULONG_MAX;
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}
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EXPORT_SYMBOL_GPL(save_stack_trace);
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static void
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save_stack_address_nosched(void *data, unsigned long addr, int reliable)
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{
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struct stack_trace *trace = (struct stack_trace *)data;
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if (!reliable)
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return;
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if (in_sched_functions(addr))
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return;
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if (trace->skip > 0) {
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trace->skip--;
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return;
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}
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if (trace->nr_entries < trace->max_entries)
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trace->entries[trace->nr_entries++] = addr;
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}
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static const struct stacktrace_ops save_stack_ops_nosched = {
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.stack = save_stack_stack,
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.address = save_stack_address_nosched,
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};
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void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
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{
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unsigned long *sp = (unsigned long *)tsk->thread.sp;
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unwind_stack(current, NULL, sp, &save_stack_ops_nosched, trace);
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if (trace->nr_entries < trace->max_entries)
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trace->entries[trace->nr_entries++] = ULONG_MAX;
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}
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EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
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